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Catalytic pyrolysis of Miscanthus x giganteus over activated alumina

Yorgun, Sait, Şimşek, Yunus Emre
Bioresource technology 2008 v.99 no.17 pp. 8095-8100
Fourier transform infrared spectroscopy, Miscanthus, aluminum oxide, atmosphere, catalysts, chromatography, new crops, nitrogen, nuclear magnetic resonance spectroscopy, pyrolysis, temperature
The catalytic effects of activated alumina (Al₂O₃) on the pyrolysis of Miscanthus x giganteus, a new energy crop, were investigated. Catalytic pyrolysis experiments carried out under static and nitrogen atmospheres were performed in a fixed-bed reactor. The final pyrolysis temperature was kept constant at 550°C in all of the experiments. The effect of catalyst loading (by weight of feedstock as 10%, 20%, 40%, 60%, 80% and 100%), heating rate (10°C and 50°Cmin⁻¹), nitrogen flow rate (50, 100, 150 and 200cm³ min⁻¹) on the pyrolysis conversion and product yields were investigated. The results were compared with those obtained in non-catalytic pyrolysis. Activated alumina catalyst has a strong influence on the Miscanthus x giganteus pyrolysis product and conversion yield. Furthermore, the catalytic bio-oils obtained from catalytic pyrolysis under static and nitrogen atmospheres were examined using elemental analysis, column chromatography, Fourier transform infrared (FTIR) and nuclear magnetic resonance (¹H NMR) spectroscopy methods.